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io_uring: don't attempt to IOPOLL for MSG_RING requests

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We gate whether to IOPOLL for a request on whether the opcode is allowed
on a ring setup for IOPOLL and if it's got a file assigned. MSG_RING
is the only one that allows a file yet isn't pollable, it's merely
supported to allow communication on an IOPOLL ring, not because we can
poll for completion of it.

Put the assigned file early and clear it, so we don't attempt to poll
for it.

Reported-by: syzbot+1a0a53300ce782f8b3ad@syzkaller.appspotmail.com
Fixes: 3f1d52abf0 ("io_uring: defer msg-ring file validity check until command issue")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-05-17 12:32:05 -06:00
parent 2d2d5cb6ca
commit aa184e8671
1 changed files with 3 additions and 0 deletions
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3
fs/io_uring.c
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@ -4481,6 +4481,9 @@ done:
if (ret < 0)
req_set_fail(req);
__io_req_complete(req, issue_flags, ret, 0);
/* put file to avoid an attempt to IOPOLL the req */
io_put_file(req->file);
req->file = NULL;
return 0;
}